Lining for ball mills



Dec 39, 1924,

4 W. M. BARKER LINING FOR BALL MILLS Filed Jan '7 4 [1/ g en ro'c Patented Dec. 30, 1924.

NI'FED STATEfi P If LINING FOR BALL MILLS.

Application filed January To all whom. it may concern:

Be it known that I, WILLIAM MATTHmv BARKER. citizen of the United States, residing at Canton, in the county of Stark and State of Ohio, have invented certain new and useful Improvements in Linings for Ball Mills, of which the. following is a specification.

My invention relates to a lining for ball, pebble, tube and rod mills and one of the objects of the invention is to provide such a lining which in use will be soft and resilient.

The single figure in the drawing is a perspective View showing the lining in place. The conventional rigid shell 1 has applied to its inner surface a layer 2, of suitable thickness, of the resilient material.

It has been found out that a hard lining, such as iron or steel, for ball and rod mills, is not as durable asa softer and more resilient material such as rubber. \Vhile sheet rubber, which has been tried. meets the requirements as to wear, it is difficult to attach and hold in place.

I.have discovered that a more desirable lining can be made of some resilient material that can be worked and compressed into place while in a plastic state so as to form one continuous single piece lining.

I have tried asbestone oxy-chloride cement and other resilient plasters and found them suitable for lmmg nulls for pulverizmg some materials. But in most cases I use a bituminous base material preferably a base of Barber Trinadad asphalt specially compounded so as to have the proper solidity and set at the highest temperature intended to reach inside the barrel when in service. This temperature varies according to the material being pulverized, the speed of rotation, and the ball load. Consequently it is necessary to vary the mix of the bituminous compound so that it will be properly set when in use under the designed working conditions and at the same time have the desired resiliency.

7, 1924. SerialbNo. 684,911.

I find that a mill so lined has all the advantages of a sheet rubber lining and in addition the lining can be securely held in ,position. The plastic material is worked and compressed into place, while in a plastic state (Witlrbituminous lining in a warm plastic state) against the inside of the mill shell or barrel, so as to form a continuous single piece lining forming a cohering surface similar to an asphalt street paving.

This lining may be anchored or bolted to the metal outer shell. In most cases. however, anchoring is not necessary. In operation, the rolling of the ball load tends to press the lining outwards against the met-a1 shell, keeping it expanded outwards in close contact with the metal. so that it cannot work out of place. The lining being in one piece cannot crack or get out of place or break away from the metal shell. This lining greatly reduces the noise of working, greatly reduces the working load and when worn iseasily renewed by common labor in the field.

I claim:

1. In a rotary grinding mill, the combination with the rigid shell and the tumbling grinding members therein, of a lining for the shell formed from a material applied While in a plastic condition to the inner surface of the shell so as to form a single piece Wearing surface, the said material after it has set being self-cemented in plaee :md resilient in use.

2. In a rotary grinding mill. the combination with the rigid shell and the tumbling grinding members therein, of a lining for the shell formed from asphalt applied while in a plastic condition .to the inner surface of the shell so as to form a single piece wearing surface, the said material after it has set being self-cemented in place and resilient in use.

' In testimony whereof I afiix my signature.

\VILLIAM MATTHEW BARKER. 

